package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("wareSkuService")

public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private OrderFeignService orderFeignService;

    @Autowired
    private WareOrderTaskService orderTaskService;

    @Autowired
    private WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;


    /**
     * 解锁仓库表中锁定的数量
     */
    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long detailId) {
        // 库存解锁
        wareSkuDao.unlockStock(skuId, wareId, skuNum);

        // 更新库存详细工作单状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailId);
        entity.setLockStatus(2); // 2 代表已解锁
        orderTaskDetailService.updateById(entity);
    }

    /**
     * 1 下单成功，接下来的业务调用失败，订单回滚，之前锁定的库存就要自动解锁
     */
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 如果还没这个库存记录
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            // TODO 远程查询sku的名字，如果失败，整个事务不用回滚
            // TODO: 2021/9/8 还能使用什么方法让出现异常以后事务不回滚？高级部分。。。
            try {
                R r = productFeignService.info(skuId);
                if (r.getCode() == 0) {
                    Map<String, Object> skuInfo = (Map<String, Object>) r.get("skuInfo");
                    wareSkuEntity.setSkuName((String) skuInfo.get("skuName"));

                }
            } catch (Exception ignored) {
            }

            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> vos = skuIds.stream().map(skuId -> {
            Long stock = wareSkuDao.getSkusHasStock(skuId);

            return new SkuHasStockVo(skuId, stock != null && stock > 0);
        }).collect(Collectors.toList());

        return vos;
    }

    /**
     * 给某个订单锁定库存
     * <p>
     * 锁库存场景：
     * 1 下单成需要解锁库存
     * 2 下单成功，接下来的业务调用失败，订单回滚，之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /*
        保存库存工作单
        追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);


        // 1 按照下单的收货地址找到最近的一个仓库发送

        // 1 找到每个商品在那个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);

            return stock;
        }).collect(Collectors.toList());

        // 2 锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStock = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                throw new NoStockException(skuId);
            }
            for (Long wareId : wareIds) {
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStock = true;

                    // TODO: 告诉 mq库存锁定成功
                    // 保存工作单详情
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);

                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, stockDetailTo);
                    stockLockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                } else {
                    // 没有锁住，重试下一个仓库
                }
            }
            if (!skuStock) {
                throw new NoStockException(skuId);
            }
        }

        // 到这里，第2步中肯定都是锁成功的

        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        /*
        解锁
        1 查询数据库，关于这个detailId 的信息
            有：
            没有：库存锁定失败，库存回滚了。这种情况无需解锁
         */
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
                /*
                解锁
                解锁：订单情况
                        1 没有这个订单。必须解锁
                        2 有这个订单。
                            订单状态：已取消，解锁库存
                                    没取消，不解锁
                */
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); // 格局订单号查询订单状态

            R r = orderFeignService.getOrderStatus(orderSn);

            if (r.getCode() == 0) {
                // 订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    // 4代表订单已经取消了
                    if (byId.getLockStatus() == 1) {
                        // 当前详情工作单，状态为1（已锁定）但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                throw new RuntimeException("远程服务失败。。。");
            }
        } else {
            // 无需解锁
        }
    }

    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下最新库存状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);

        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>()
                        .eq("task_id", id)
                        .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }
}